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Akademický článek

A bias-corrected GEMS geostationary satellite product for nitrogen dioxide using machine learning to enforce consistency with the TROPOMI satellite instrument

Autor: Y. J. Oak, D. J. Jacob, N. Balasus, L. H. Yang, H. Chong, J. Park, H. Lee, G. T. Lee, E. S. Ha, R. J. Park, H.-A. Kwon, J. Kim

Publikováno v: Atmospheric Measurement Techniques, Vol 17, Pp 5147-5159 (2024)

The Geostationary Environment Monitoring Spectrometer (GEMS) launched in February 2020 is now providing continuous daytime hourly observations of nitrogen dioxide (NO2) columns over eastern Asia (5° S–45° N, 75–145° E) with 3.5 × 7.7 km2 pixe

Externí odkaz: https://doaj.org/article/91a0936e98f04c15b001880ebe9ffa7c

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Akademický článek

Intercomparison of GEOS-Chem and CAM-chem tropospheric oxidant chemistry within the Community Earth System Model version 2 (CESM2)

Autor: H. Lin, L. K. Emmons, E. W. Lundgren, L. H. Yang, X. Feng, R. Dang, S. Zhai, Y. Tang, M. M. Kelp, N. K. Colombi, S. D. Eastham, T. M. Fritz, D. J. Jacob

Publikováno v: Atmospheric Chemistry and Physics, Vol 24, Pp 8607-8624 (2024)

Tropospheric ozone is a major air pollutant and greenhouse gas. It is also the primary precursor of OH, the main tropospheric oxidant. Global atmospheric chemistry models show large differences in their simulations of tropospheric ozone budgets. Here

Externí odkaz: https://doaj.org/article/712cd78ebcad42cf96a097d637349c22

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Akademický článek

Interpreting Geostationary Environment Monitoring Spectrometer (GEMS) geostationary satellite observations of the diurnal variation in nitrogen dioxide (NO2) over East Asia

Publikováno v: Atmospheric Chemistry and Physics, Vol 24, Pp 7027-7039 (2024)

Nitrogen oxide radicals (NOx≡NO+NO2) emitted by fuel combustion are important precursors of ozone and particulate matter pollution, and NO2 itself is harmful to public health. The Geostationary Environment Monitoring Spectrometer (GEMS), launched i

Externí odkaz: https://doaj.org/article/9c1c8982c1c147dbbebbedd70bf09f8e

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Akademický článek

Coarse particulate matter air quality in East Asia: implications for fine particulate nitrate

Autor: S. Zhai, D. J. Jacob, D. C. Pendergrass, N. K. Colombi, V. Shah, L. H. Yang, Q. Zhang, S. Wang, H. Kim, Y. Sun, J.-S. Choi, J.-S. Park, G. Luo, F. Yu, J.-H. Woo, Y. Kim, J. E. Dibb, T. Lee, J.-S. Han, B. E. Anderson, K. Li, H. Liao

Publikováno v: Atmospheric Chemistry and Physics, Vol 23, Pp 4271-4281 (2023)

Air quality network data in China and South Korea show very high year-round mass concentrations of coarse particulate matter (PM), as inferred by the difference between PM10 and PM2.5. Coarse PM concentrations in 2015 averaged 52 µg m−3 in the Nor

Externí odkaz: https://doaj.org/article/4cdf89ae69f74737b9d41e21dddd29c3

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Akademický článek

Why is ozone in South Korea and the Seoul metropolitan area so high and increasing?

Autor: N. K. Colombi, D. J. Jacob, L. H. Yang, S. Zhai, V. Shah, S. K. Grange, R. M. Yantosca, S. Kim, H. Liao

Publikováno v: Atmospheric Chemistry and Physics, Vol 23, Pp 4031-4044 (2023)

Surface ozone pollution in South Korea has increased over the past 2 decades, despite efforts to decrease emissions, and is pervasively in exceedance of the maximum daily 8 h average (MDA8) standard of 60 ppb. Here, we investigate the 2015–2019 tre

Externí odkaz: https://doaj.org/article/ae73e27b702a4cc985cd007fe12da8ab

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Akademický článek

Energy loss function of samarium

Autor: T. F. Yang, R. G. Zeng, L. H. Yang, A. Sulyok, M. Menyhárd, K. Tőkési, Z. J. Ding

Publikováno v: Scientific Reports, Vol 13, Iss 1, Pp 1-8 (2023)

Abstract We present a combined experimental and theoretical work to obtain the energy loss function (ELF) or the excitation spectrum of samarium in the energy loss range between 3 and 200 eV. At low loss energies, the plasmon excitation is clearly id

Externí odkaz: https://doaj.org/article/c5479f2523ae483491a1b285e5f57094

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Akademický článek

Tropospheric NO2 vertical profiles over South Korea and their relation to oxidant chemistry: implications for geostationary satellite retrievals and the observation of NO2 diurnal variation from space

Autor: L. H. Yang, D. J. Jacob, N. K. Colombi, S. Zhai, K. H. Bates, V. Shah, E. Beaudry, R. M. Yantosca, H. Lin, J. F. Brewer, H. Chong, K. R. Travis, J. H. Crawford, L. N. Lamsal, J.-H. Koo, J. Kim

Publikováno v: Atmospheric Chemistry and Physics, Vol 23, Pp 2465-2481 (2023)

Nitrogen oxides (NOx≡ NO + NO2) are of central importance for air quality, climate forcing, and nitrogen deposition to ecosystems. The Geostationary Environment Monitoring Spectrometer (GEMS) is now providing hourly NO2 satellite observations over

Externí odkaz: https://doaj.org/article/78ec8ac36d044cfd9ff897908012878f

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Akademický článek

Ginsenoside Rb1 from Panax notoginseng Suppressed TNF-α-Induced Matrix Metalloproteinase-9 via the Suppression of Double-Strand RNA-Dependent Protein Kinase (PKR)/NF-κB Pathway

Autor: Wen-Tao Sun, Cindy L. H. Yang, Terry C. T. Or, Dan Luo, James C. B. Li

Publikováno v: Molecules, Vol 27, Iss 22, p 8050 (2022)

Chronic inflammation is commonly accompanied by the stimulation of matrix metalloproteinases (MMPs) production and the degradation of the extracellular matrix. The overexpression of MMP-9 (Gelatinase B) highly participates in the progression of pathe

Externí odkaz: https://doaj.org/article/e4eb5db9b7fb4452850b5e47b9649f2d

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